Stop-index system for boring-mills.



F. F. CLARKE'.

ISTOP INDEX SYSTEM FOR BORING MILLS.

- APPLICATION FILED nic. 3. 1914. IIEIIEWED MAY Io. 191e.

I., Patented June 20,1916.

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F.F.CLARKL STOP INDEX SYSTEM FOR BORlNG MILLS. APPLICATION FILED mic. 3.m4. RENEW'ED MAY 10. 1916.

Lww. Patented June 20,1916.

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WUUWWM WITNESSES TOR ATTORNEY ma COLUMBIA PLANDURAPM co., wAsmNumn.

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FREDERICK F. CLARKE, OF FRANKLIN, PENNSYLVANIA, .ASSIGNOR TO COLBURNMACHINE TOOL COMPANY, OF FRANKLIN, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

STOP-INDEX SYSTEM FOR BORING-MILLS.

Specification of Letters Patent.

Application led December 3, 1914, Serial No. 875,335. Renewed May 10,1916. SeriaI No. 961,712.

To all al1/omit may concern:

Be it known that I, FREDERroK F. CLARKE, citizen of the United States,residing at Franklin, in the county of Venango and State ofPennsylvania, have invented certain new and useful Improvements inStop-Index Systems for Boring-Mills, of which. the following is aspecification.

The object, construction, application and utility of my improvedfeed-stop index, are herein set forth with sufficient clearness toenable those skilled, in the art of boringmill construction to make andus'e the same.

The object of this invention is, to provide a boring-mill with asuitable stop-index system for the feed, which will indicate when acertain operation of the machine has reached a predetermined point, or,in other words, when a tool which is in operation has reached a definitepoint at which its operation should be discontinued.

In boring-mills whichemploy a turrethead, the turret is supplied with aplurality of tools which operatesuccessively upon the work that isbeingdone, usually, each successive tool proceeding with the work from thepoint at which the preceding tool ceased to operate.V In order toobviate the necessity of making "actual measurements of the work, todetermine whether a tool has reached the predetermined limit of itsoperation, the element which causes the feed-actuation, or some othersuitable element ofthe machine, or two such elements, are supplied witha suitable index or indexes which automatically indicate the desiredinformation in said particular.

It is the particular object of this invention to provide'a plurality ofsuch indexes and combine them into areadily-readable system, `and moreparticularly to provide means whereby the various indicating-devicesemployed may be. securely locked in their proper positions so that anyvotherwise possible accidental movement of same will be prevented `andthe necessary accuracy insured.

rllhe construction whereby I attain said objects, is clearly shownin thedraw-ings, the various Hgures of which are as follows:

Figure 1 is a front elevation of a portion of one end of theVcross-railof a boringmill, showing a portion of a feed-screw, with a portion of myimproved index-system applied thereto, Fig. 2 is a face View of anindex-point employed upon said screw, Fig. 3 is an edge view of saidpoint, Fig. 4 is a front elevation of the cross-rail of a boring-mill,supplied with a turret-head and showing my improved system of indexesapplied thereto, Fig. 5 is a fragmentary plan view of the turret-slide,the way in which the supplementary indexes are applied thereto, beingspecially illustrated, Fig. 6 is a fragmentary end view of thecross-rail, showing the way in which my indexes are applied thereto,Fig. 7 is a portion of the scale-element which forms a portion of thissystem.

The same reference-numerals are applied to identical parts in all theviews.

The index-system here shown consists of the combination of what I termthe micrometer-element, the function of which is, to indicate minutemeasurements, as hundredths of an inch or fractions thereof, and ascale-clement,ithe oflice of which is, to indicate the largerdimensions, such as are easily Vreadable upon a flat scale.

The micrometer-element of the system is applied to the feed-screw, whichcauses the horizontal feed-movement of the saddle upon the cross-rail,and to the feed-shaft, which causes the vertical movement of theturret-slide within said saddle. rfhe scaleelements of the system couldbe variously applied to any suitable portion of a stationary element,which is suitably located with reference to said feed-actuated. element.

In the drawings, two separate systems are shown, one to indicate themovement of the saddle upon the cross-rail, and the other to indicatethe movement of the turret-slide within the saddle. rEhe drawings are somade, for the purpose of being fully explicit, but inasmuch as onesystem is practically a duplicate of the other, but one system-thatrelating to the feed of the saddle upon the cross-railwwill bedescribed.

I will now describe in detail the construction and combination of theelements of said system. The feed-screw previously mentioned isindicated by the reference-numeral 1 in the drawings; said screw ispower-driven to cause the feed-actuation of said saddle, and eachrevolution of'said screw will cause a certain definite, prede- ]PatentedJune 20, 1916.

termined feed-advance of said saddle, which, for the purpose ofillustration, we will call one-quarter of an inch. The end of saidscrew, which projects beyond the cross-rail, is provided with the usualsleeve 2, which adapts the same to be crank-actuated. Upon the inner,reduced portion of said sleeve, is mounted an index-collar 3, which isin proximity to the adjacent end of the cross-rail 4. Said collar 3 issecured to the sleeve 2 by means of the set-screw 5, and by looseningsaid screw, said collar may, if desired, be adjusted revolubly upon saidsleeve, which sleeve is keyed to said screw 1.V Collar 3 is providedwith clamping-face 6, in which is :formed an index-retaining groove 7.In juxtaposition to said clamping-face is mounted the clamping-ring 8,which is Vlikewise providedwith an index-retaining groove 9. Said ringisprovided with a key-seat 10,

vwhich engages the pin 11, thus preventing the ring from revolving. Aclamping-nut 1,2 is provided, and mounted upon a threaded portion ofsaid sleeve and arranged to bear against said ring, to cause theclamping'action thereof.

VThe periphery of the indeX-collar3 is providedwith suitable graduations13, and the adjacent face of the cross-rail is provided with aV singleregistry-mark `141:, with Which said graduations are .adapted toregister Yor Y coincide, and indicate'thei'progress of the feed, withinthe limit defined by one-revolution Vof said screw. Y Y Y YFor eachtoolthat is contained in the tur- Q vret'15,1I providean index-point 16,Figs. 2

V.and 3, V'which in this case will be live points,

asA Yshown bythe `number of'sockets 17in said turret..y Saldfsocketsarev numbered from 1 Y to 5. @consecutively.l SaidV index-pointVconsistso aV strip of resilient sheet-metal, which 'upon saidYVindeX-collar'- by inserting the leavesr19 and 20 thereof between theclamping-faces of the collar 3 and ring V8 With the eye 18 occupying theretaining-groove 7-9,

' -which prevents `the accidental displacement ofthe pointsrwhen the nut12 is unscrewed. Each of the five points 16 is numbered Y. upon theouter face thereof, to denote to which Vturret-socket it relates, andbefore the `operation of the boring-mill is started upon vacertain-pieceof work, points 16. are adjusted 'circumferentially ofcollar 3,jt0 denotel the point at which the operation of the Y. tool toVwhich it `relates is to be discontinued.

`Said adjustment is accomplished by loosening nut 12, and moving saidpoints as desired; the frictional contact of leaves 19 and 20 againstthe clamping-faces of the members 3 and 8 will retain said pointstemporarily in place until all of said points are suitably adjusted, andwhen the adjusting operation is complete, nut 12 is tightened, thusfirmly clamping said points in their respective positions. Now, as theoperation of the machine proceeds, and as the various index-points, asthey` travel with the collar 3, pass the registry-mark 14, they willrespectively denote or indicate the distance of travel of the toolcarried by the correspondingly-numbered socket of the turret. In manycases, the distance which a given tool must travel in order toaccomplish its allotted work, will be more than the distance representedby one revolution of the screw 1 and collar 3, hence it becomesnecessary to provide supplementary means to indicate such a requirement.Said supplementary means consists of a scale 21, which is'attached tothe cross-rail upon which the saddle 22 travels, an enlarged' view ofwhich scale is shown in Fig. 7. Aiixed to the edge of said saddle, inclose proximity to said scale, is an index 23, whiclrindicates uponscale 21 the total distancetraveled by said saddle. Upon said scale aremounted five index-points 24, which correspond in number to the numberof sockets in said turret, each also heilig correspondingly numbered.Said points are mounted upon said scalei21 and adjustable longitudinallythereof. At the back of said scale is located Ya lockingdevice for saidpoints, which consists of a Yrod 25-F ig. G-for which a groove 2G isformed in the cross-rail; a flat 27 is milled upon said rod, and whenthe same is turned so that said fiat is in juxtaposition to said scale,said points may be freely moved longitudinally of said scale and each ofsaid points adjusted to a'position to indicate approximately thestop-point of each tool to which it relates; when said adjustment iscomplete, a partial turn of said rod by means of the lever 28 will causethe unmilled or normal surface of said rod to bear firmly Vupon all ofsaid'points, thus simultaneously locking them all, and each one in itsrespective indicative position, thus preventing anv accidentaldisplacement of same.

The combination of the two indicatingelements here shown, is necessary,for the following reasons: In present-day machinetool operations, theemployment of dimensions such a hundredth` half a hundredth or even athousandth of an inch, are matters .of every-day practice, and suchdimensions vcannot be determined With the scaleelement here shown, butthey can readily be measured and indicated by the micrometerelement.TakenY alone, however, its limit of indicated measurement is onerevolution, or,

as previously stated, one quarter of an inch,- hence to approxin'iatelyrecord extended dimensions, the scale must be employed.

Fig. 5 is an enlarged plan View of the scale and locking device, as itis applied to the turret-slide 29, the scale being shown at 30, theadjustable points at 3l, the index at 32, the locking-rod at 33, and themanipulating-lever for said rod at 3d; all of which operate insupplemental conjunction with the micrometer-index upon the feed-rod 35which feeds said turret-slide vertically.

It will be readily understood by those skilled in the art to which thisinvention relates, that the horizontal feed of the tools and thevertical feed of the same are not usually, if ever, simultaneouslyemployed, and that when the turret-slide is moving vertically in thesaddle, said saddle is stationary. By keeping this point in mind, aclearer understanding of the invention, as defined in the claims, willresult.

I claim the following:

l. In a boring-mill equipped with a plurality of tools arranged tooperate successively upon the work to be performed, an index-systemconsisting of the combination of a micrometer-element and ascale-element, arranged to conjointly indicate the extent of the work ofeach of said tools, said 1nicrometer-element consisting of a graduatedcollar carried by a revoluble element which causes the feed-actuation ofsaid tools, index-points adjustably carried by i rid collar, a fixedregistry-mark with which said points successively register, means forsinlultaneously locking all of said points in their respectiveindicative positions, a movable tool-carrying element, a stationaryelement upon which said carrying-element travels, a graduated scaleaflixed to said stationary element, in close proximity to saidcaiTying-element, plurality of adjustable index-points mounted upon saidscale, an index carried by said tool-carrying element, adapted to denoteapproximately, by successive registry with said scale-points, the extentof the work of each of said tools, and means for simultaneously lockingsaid scale-points in their respective denoting-positions.

2. In a feed-stop index-system for boringmills, an element of suchsystem, comprising a collar provided with graduations upon the peripherythereof, secured to the feedscrew, one lateral face of said collar beingarranged to constitute a clamping-face for the engagement of adjustableindex-points, index-points mounted upon said collar, in contact withsaid face, a clamping-ring mounted in juxtaposition to saidclampingface, and adapted to coperate with said collar in the engagementof said points, and a nut adapted to actuate said ring into theclamping-position.

3. In a feed-stop index-system for boring-mills, an element of suchsystem consisting of a scale secured to a stationary element of suchmill, in proximity to a feedactuated element, a plurality of indexpointsmounted upon said scale and adapted to be moved longitudinally thereof,lockingmeans for said points, arranged to simultaneously lock all ofsame in .their respective adjusted positions, and a point carried bysaid feed-actuated element, arranged to register successively with saidindex-points, and indicating the progress of said feed-actuated element.

In a feed-stop index-system for boringmills, an element of such systemconsisting of an index-point composed of resilient sheet-metal which isformed at one end into a point, and in proximity to the other endthereof is bent at a right angle, then formed into an eye, then returnedto the original line, whereby two parallel leaves or frictional membersare formed, adapted te temporarily retain said element between twoadjacent faces of a clamping-device, in combination with a clampingdevice consisting of a collar carried by a revoluble element which isoperable to cause the feedactuation of the tools of said mill, a.lateral face of said collar adjacent to the periphery thereof beingformed into a clamping face, there being an annular groove adjacent tosaid clamping face for the reception of said eye, a ceperating clampingring with a lateral face thereofl arranged in juxtaposition to saidfirst-mentioned clamping face, said clamping faces being adapted to bearupon the respective sides of said parallel leaves,

and means operable to actuate said clamping ring into its cooperativeclamping position with said collar, for the purpose set forth. Intestimony whereof I affix my signature in presence of two witnesses.

FREDERICK F. CLARKE. Witnesses MARY B. Eclinn'r, RAY S. CLARKE.

@epica of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

